Construction of electric motors and dynamos.



c. E. WILLEY. v CONSTRUCTION OF ELECTRIC MOTORS AND DYNAMOS.

APPLICATION FILED IOV.16, 1910.

Patent'd Aug. 8,1911.

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UNITED STATES PATENT OFFICE.

CHARLES E. WILLEY, OF LOUISVILLE, KENTILCKY, ASSIGNOR TO JAS. CLARK JR. ELECTRIC COMPANY, OF LOUISVILLE, KENTUCKY, A CORPORATION OF KENTUCKY.

CONSTRUCTION OF ELECTRIC MOTORS AND DYNAMOS.

To all whom it may concern:

Be it known that I, CHARLES E. WILLEY, a citizen of the United States of America, and a resident of Louisville, county of Jefferson, and State of Kentucky, have invented certain new and useful Improvements in Construction of Electric Motors and Dynamos, of which the following is a specification.

My invention relates to improvements in electric dynamos and motors, and particu larly to improvements in means for holding pole pieces to their frames.

According to my invention I provide adjacent surfaces of the pole piece and the frame with registering key slots extending longitudinally of the frame, the said key slots of the frame extending beyond the pole piece, so that a key may be placed in such extended portion of the slot and then slid through the slot into engagement with the slot of the pole piece. Thereby the necessity for using a plurality of bolts or studs to hold each pole piece in place is obviated, which in turn obviates the necessity of boring and screw-threading a plurality of bolt holes or stud holes in each pole piece; so that, as a result of my invention the cost of building electric dynamos and motors, particularly small electric dynamos and motors, is very much reduced.

The object of my invention is to provide improved means for securing pole pieces of electric motors and dynamos to their frames and to reduce the cost of building such dynamos and motors.

I will now proceed to describe my invention with reference to the accompanying drawing and will then point out the novel features in claims.

In said drawing: Figure 1 shows a side elevation and partial section of a field frame of an elcetric dynamo or motor with pole pieces secured thereto in accordance with this invention; Fig. 2 shows a central transverse section of the structure shown in Fig. 1; Fig. 3 shows a side elevation and partial section, and Fig. 1 shows a central trans verse section, of an alternative structure.

Referring now to the drawings, and at first to Figs. 1 and 2, 1 designates the field frame, 2, 2 pole pieces of ordinary form, 3 a longitudinal or circumferential key slot provided in the inner side of the frame 1, and 4, 4 designate parallel and registering Specification of Letters Patent.

Application filed November 16, 1910.

Patented Aug. 8, 1911.

Serial No. 592,731.

key slots formed in the adjacent faces of the pole pieces 2, and 5, 5 designate keys engaging both the slots of the field frame and the slots of the pole pieces. 6, 6 designate screw studs for holding the pole pieces to the field frame. It will be seen that, but for the keys 5 registering with the keyways 3 and 4, at least two of these studs would be necessary for each pole piece, to hold the pole piece rigid with respect to the frame; and the use of two such studs would require the boring and tapping or threading, in each pole piece, of two holes, besides the making and threading of two studs for each pole piece. By dispensing with one of these studs and by providing instead registering key slots, and keys therein, the cost of construction is considerably reduced, because in turning the inner face of the field frame 1, the key groove 3 can be turned therein at practically no additional expense; and similarly, when facing off the base of each pole piece the key slot 4 can be turned therein with practically no additional expense. The cost of the keys themselves is almost negligible.

In some cases, as illustrated particularly in Figs. 3 and 4, I provide the field frame 1 with short projecting stubs 7, forming bases for the pole pieces 2. In such case the registering key slots 3 are formed in these stubs 7, rather than in the main portion of the frame 1; the construction being in other respects substantially the same as shown in Fig. 1. This construction of Figs. 8 and 1 considerably decreases the amount of machining required, and thereby reduces considerably the cost of the structure; for instead of being required to machine the entire interior of the frame 1, as in the construction shown, in Figs. 1 and 2, it is necessary merely to face off the end of the stubs 7 and, in so doing, to cut the key slots 3 therein. The said stubs 7 may of course form any desired portion of the effective length of the core portions of the pole pieces; that is to say, these stubs may be short or long, and correspondingly, the pole pieces may be long or short, as desired; the stubs forming, in effect, parts of the core portions of the pole pieces.

While I have illustrated my invention as embodied in the field frame of a four pole machine, it will be obvious that the invention is applicable for use both in dynamos and in motors, and is applicable wherever pole pieces are secured to frames, whether the pole pieces and frame are to be stationary or revoluble in the operation of the machine.

I am aware that it has been proposed heretofore to employ keys in various ways for holding pole pieces rigid with respect to their supporting frames; but so far as I am aware in such former instances of the use of keys, the keys have been transverse to the frame, that is to say, to the plane of rotation of the rotor of the machine, instead of being longitudinally arranged, that is to say, in the plane of rotation of the rotor of the machine, as in this case. In turning up a frame for the reception of the pole pieces, it is practically essential that the turning tool shall revolve in the plane of rotation of the rotor so that a transverse key slot must be cut by a separate operation, and, generally, in a separate machine, so that the formation of such key slot involves both the transportation of the frame to a different machine and the resetting of the frame several times in such machine, one setting for each key slotto be cut. The longitudinal keys are quite as effective for holding the pole pieces rigid as are transverse keys, and as above pointed out, their keyways may be cut during the facing of the frame and pole pieces, and with practically no additional expense.

In certain of the following claims the expression circumferental keyway is employed to designate a keyway in the plane of. rotation of the armature of the machine, as distingushed from a transverse keyway; and is employed as generic to a continuous keyway, such as embodied in the construction shown in Figs. 1 and 2, and an interrupted keyway such as embodied in the con struction shown in Figs. 3 and 4.

\Vhat I claim is 1. An electric machine comprising in. combination a pole-piece frame, a pole piece, and fastening means securing the pole piece and frame together, said pole piece and frame having registering longitudinally arranged keyways, and a key fitting in such key way and holding the frame and pole piece rigid with respect to each other.

2. An electric machine comprising in combination a substantially circular pole piece frame, one or more pole pieces, and fastening means securing the pole piece or pieces and frame together, said frame having a circumferential keyway and said, or each pole piece having a corresponding registering keyway, and a key for said, or each pole piece, fitting in the keyway thereof and in the registering keyway of the frame, and holding the frame and pole piece rigid with respect to each other.

3. An electric machine comprising in combination a substantially circular pole piece frame, one or more pole pieces, and a screw for said, or each such pole piece, passing through the frame and threaded into the pole piece and serving to hold same to the frame, the pole piece having a circun'lfcrential keyway, said, or each pole piece having a corresponding and registering keyway, and two keys for said, or each pole piece fitting into the keyway of said pole piece from opposite sides thereof, and also fitting into the keyway of the frame, and holding the frame and pole piece rigid with respect to each other.

a. An electric machine comprising in combination a pole piece frame, provided with a projecting portion forming a base for a pole piece, a pole piece fitting against said base portion, and fastening means securing the pole piece and frame together, said pole piece and base portion having registering longitudinally-arranged keyways, and a. key fitting in such key way and holding the frame and pole piece rigid with respect to each other.

5. An electric machine comprising in combination a substantially circular pole piece frame, provided with one or more projecting portions forming bases for pole pieces, one or more pole pieces fitting against said bases, and fastening means securing the pole piece or pieces and frame together, said pole piece base or bases having a circumferential keyway and said, or each pole piece having a corresponding registering keyway, and a. key for said, or each pole piece, fitting in the keyway thereof and in the register ing keyway of the corresponding pole piece base, and holding the frame and pole piece rigid with respect to each other.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

CHARLES E. VILLEY. \Vitnesses MILLER G. SPARKS, LILLIAN Gr. STUcY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atents, Washington, D. C. 

